使用外键从表中检索数据

Question

I was wondering how can I retrieve data from table3 with the use of 2 foreign keys. I will show you my tables first then try to explain what I am trying to do and how I am doing it.

Table1
ID Primary key

Table2
ID Foreign key
foodID Foreign Key

Table3
foodID Primary key
food 

So I would first get the ID in the first table and compare it with the ID in the second table and get a foodID (note this relationship is a 1 to many, so I can have many foodIDs per ID). Then I want to output all foods by using the foodID. Heres an example of what I mean because I don't feel its too clear.

Say we have and ID = 1 and in this we have foodID = 1 and foodID = 2 and lastly foodID of 1 means food = pasta and foodID of 2 means food = mince meat . So in the end I would like to output both pasta and mince meat .

Heres the code I have so far, in the example above it will only output pasta and not mince meat :

public function getFood($id){
        $data = $this->db->get_where('Table2', array('ID' => $id)); //Where $id is the ID in Table1
        $Result = $data->result();
        foreach($Result as $row){
            $fID = $row->foodID;
        }
        $data = $this->db->get_where('Table3', array('foodID' => $fID));
        return($data);
    }  

Heres my view where I output the food:

foreach($results as $row){
            echo $row->food;
        }

Answer 1

You just need to do a join:

public function getFood($id){
    $this->db->select('*');
    $this->db->from('Table3');
    $this->db->join('Table2', 'Table2.ID = Table3.foodID');
    $this->db->where('Table2.Id',$id);

    $result = $this->db->get();
    return $result;
}